Improvement in machines for rolling harrow-teeth



SAMUEL C. MURDOCH.

Improvement in Machines for Rolling Harrow-Teeth.

No. 21,653. I Patentednmsmsn.

Mine mes flu 622507."

% yr. wg J/MMZ UNITED STATES ATE T SAMUEL O. MURDOUH, OF PITTSBURG, PEJN SYLVAN IA.

Specification forming part of Letters Patent No. 121,653, dated December 5, l -77l.

To all whom it may concern:

Be it known that I, SAMUEL (1. MURDOOH, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Machine for Rolling Bars of Metal into a Taper Form 5 and I do hereby declare the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing and the letters of reference marked thereon.

The object of my invention is to reduce a bar ofmetal that is rectangular in crosssection, or the extremity of such a bar, to a pyramidal form with four sidesbars of such form being useful for many purposes, and particularly in the manufacture of barrow-teeth, in the manufacture of which, mainly, I contemplate using it.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

In the accompanying drawing, which forms part of my specification, Figure 1 is a side elevation of my improvement in machine for reducing bars of iron to a pyramidal form with four sides. Fig. 2 is a vertical transverse section of the same at line y.

The frame or housing A is of ordinary construction, and is provided with bearings 00 w and guide so, in which are arranged adjustable points 02 to directly opposite the grooves or cavities s in the die j, which is fitted into and secured to roll 0. On the face of the die g, which is fitted in and secured to'roll B, are tongues c c, of such length and shape as to exactly fill, laterally and longitudinally, the grooves s t. The grooves or cavities in the die f and the tongues or projections a c on the face of the die 9 may be made on the roll B, and in the roll 0 if so desired. But it will be found more convenient to use the dies so arranged in the rolls that they may be changed at the pleasure of the operator. The cavities in the die f are wider and of greater depth at their front end than at their back end that is to say, they gradually contract in breadth and depth from the front end to the back end. The tongues or projections of the die 9 also gradually diminish from the front end to their back end, but increase in depth, and fit neatly and closely to the sides of the grooves or concavities in the die f. The roll B and die 9 are adjusted with relation to the roll 0 and its die f through the medium of screws k and m.

The construction and arrangement of my improvement in machines for rolling metal will readily be understood from the foregoing description and by reference to the accompanying drawing.

I will therefore proceed to describe its operation The rolls B and (I being revolved through the medium of the wheels I and m, iron of suitable size is placed against the projection 'v, and the dies fand yrevolving with the rolls will impinge upon the iron and spread it out in the concavity 8, forcing or pressing the iron down and back into the concavity and backward from the operator, giving to the iron a taper form. The motion of the roll and dies having delivered the iron toward the operator, he turns it one fourth around, placing the end of a partiallyformed point against the projection u, (the iron when turned one-fourth aroundbeing less in width than the next concavity 2,) and the revolving of the dies will cause the iron to be pressed down into the concavity t and drawn out a de gree further, in the process of giving the desired form, by the revolving action of dies. The further finishing of the article is accomplished by other means and labor which it may require to complete its construction as an article of manufacture.

In the process of rolling iron, as hereinbefore described, the iron is gradually broken down by two or more passers, and is turned one-fourth around at each pass after coming from the first concavity of the die f, the iron being forced back in the concavities in the die from the operator, and is discharged from the die while moving toward him.

I am aware that roller-die grooves circular in cross-section,and with convergent bounding walls or surfaces for rolling bars to a taper form, are common, and also that roller-die grooves, more or less rectangular in cross-section, and with convergent walls or surfaces, are and have been used for rolling bayonet-blades and, perhaps, other articles and it is also known to me that Andrew H. Holmes, of Allegheny City, Pennsylvania, claims to have invented a device and has applied for a patent therefor for rolling harrow-tceth, consisting of a pair of rolls, on or in one of which is mounted a die-groove the bottom and side walls of which are convergent and perpendicular to one another viewed in cross-section, while upon the other roll is mounted a projecting tongue of length and breadth corresponding accurately to the length and breadth of the die-groove, and gular in eross-section and in length and breadth oi whieh the periphery is eeeemrie. the mode of eorres iondin; aeeurately t0 the die-grooves, and operation of the deriee being sueh, it is said, with eeeentrie peripheries jointly with the rolls that at one pass the bar suhieeted to its aetion and with the adjustable guides and stops, said will be redueed on all four sides to a tapered seriesol'grooresandtongues, two ormore ot'eaeh form, rectangular in eross-seetion. in number, being, from first to last of diminished These inventions. all and severally. I hereby area and used for the gradual reduction of the disclaim; but bar to a taper form, in the manner herein set \Vhat I do elaini, and desire to seeure by Letforth. ters Patent, is- SAMUEL C. MURDOCH.

The series of die-grooves x and f, eaeh groove j rectangular ll] eross-seetion and havingeonverg- \Vitnessesz ent walls or bounding sin-fares, and the series of JAMES J. JOHNSTON, tongues or projections 11 r. each tongue reetan- L. C. THOMAS. (73) 

